docs: def cli(env, sortby, datacenter, identifier, subnet_type, network_space, ipv4, ipv6):
      """List subnets."""
  
      mgr = SoftLayer.NetworkManager(env.client)
  
      table = formatting.Table([
          'id', 'identifier', 'type', 'network_space', 'datacenter', 'vlan_id',
          'IPs', 'hardware', 'vs',
      ])
      table.sortby = sortby
  
      version = 0
      if ipv4:
          version = 4
      elif ipv6:
          version = 6
  
      subnets = mgr.list_subnets(
          datacenter=datacenter,
          version=version,
          identifier=identifier,
          subnet_type=subnet_type,
          network_space=network_space,
      )
  
      for subnet in subnets:
          table.add_row([
              subnet['id'],
              '%s/%s' % (subnet['networkIdentifier'], str(subnet['cidr'])),
              subnet.get('subnetType', formatting.blank()),
              utils.lookup(subnet,
                           'networkVlan',
                           'networkSpace') or formatting.blank(),
              utils.lookup(subnet, 'datacenter', 'name',) or formatting.blank(),
              subnet['networkVlanId'],
              subnet['ipAddressCount'],
              len(subnet['hardware']),
              len(subnet['virtualGuests']),
          ])
  
      env.fout(table)